Cats have a relatively short digestive tract so proper dosage of any medication, including natural antibiotics is critical. (onpets.com)
Dogs have a much shorter digestive tract than we do, so their bodies have a tougher time digesting a natural dog food diet they are not used to. (organic-pet-digest.com)
Ferrets have very short digestive tracts that don't have the ability to digest complex carbohydrates. (petbusiness.com)